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Message 1 of 4

BT Junction Box Wiring


While I was decorating my room I accidentally pull the BT cable out from a junction box. Now my Internet has stopped working as well as my phone.

So I have one cable coming out from the wall which was going into the junction box another cable coming from the master socket to the junction box. All I need to know is how to wire the junction box. I have called BT and they have said they will charge £125 just to come out and look at it. Could anyone please help me before I have to pay BT to do it.

Below are some pictures of the wires and the junction box.

Cable coming from master socket:

Cable coming from outside:

Junction Box:

If you need any more information please let me know. Thanks in advance

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Distinguished Sage
Distinguished Sage
Message 2 of 4

Re: BT Junction Box Wiring

to decide which pair of wires coming from master socket just check the back of master socket and see which wires are connected to terminals A&B.  they are the pair you need to connect to the 2 incoming openreach wires

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Distinguished Guru
Message 3 of 4

Re: BT Junction Box Wiring

You are not allowed to touch/tamper/re-connect any wires prior to your main socket I am afraid. You will need to get your CP to arrange a visit from Openreach.

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Aspiring Expert
Message 4 of 4

Re: BT Junction Box Wiring

The green/black is pair 2 of a D/W10 or 10b.... The box is a BT52a, BT as in Block Terminal, not British Telecom....

The blue/blue/white is pair 1, you would just need to screw the black into one of the screw terminals then the blue/white into the screw opposite it... Then the green to the blue cable... I would just double check the blue/blue/white is connected to the back on the A and B terminals on the NTE.... Or if you have a LJU/1 then check there connecteded to the 2 and 5 terminals....

If one of the other pairs are then match them up on the BT52a as mentioned above....
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